从理论上讲，把非洲猎豹引进美国西部，可以让叉角羚重新回到生物学家所说的自然进化轨道上。

Importing African cheetahs to the western United States could, in theory, put the pronghorn back onto its natural evolutionary trajectory according to these biologists.

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政策制定者和经济学家们自然都对美国的惩罚关税政策难以认同，很多人认为一个对中国负债累累的国家对债权国提出威胁实在是不智之举。

Its policymakers and economists are, of course, united in their distaste for America’s tariff talk.

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纽约美国自然史博物馆的天文学家马克·麦克卢承认这是个麻烦的问题，但现在我们可以说它曾经是个问题，因为麦克卢和他的同事已经解决了这个问题。

"It's a problem," admits Mordecai-Mark Mac Low, an astronomer at New York's American Museum of Natural History. Or, rather, it was a problem - but Mac Low and his collaborators may have solved it.

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